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การเขียนโปรแกรมและการประ
การเขียนโปรแกรมและการประ

... A database object is a named data structure that is stored in a database. The specific types of database objects supported in a database vary from vendor to vendor and from one database model to another. Database model refers to the way in which a database organizes its data to pattern the real wor ...
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... data sources through a mediating ontology. Most research conducted in this area tackles ontology expressivity, computational efficiency of reasoning services and inferences associated to query answering. In this paper, we argue that data quality and data cleansing are domains where OBDA could contri ...
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... Queries are parsed and executed against each of the data sources in real-time and then the results are combined into a single result set and sent back to the client. The ODBC driver developed using OpenAccess SDK can enforce all the business rules, data conversions, security, and data configurations ...
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... TB cases, and etc. are stored in Micro Excel, Micro Access or dBase files. Many dynamical data analyses and reports need to combine the data from different sources. Therefore, automatically and directly pulling data from different database management systems (DBMS) or spreadsheets into SAS will be v ...
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Data model



A data model organizes data elements and standardizes how the data elements relate to one another. Since data elements document real life people, places and things and the events between them, the data model represents reality, for example a house has many windows or a cat has two eyes. Computers are used for the accounting of these real life things and events and therefore the data model is a necessary standard to ensure exact communication between human beings.Data models are often used as an aid to communication between the business people defining the requirements for a computer system and the technical people defining the design in response to those requirements. They are used to show the data needed and created by business processes.Precise accounting and communication is a large expense and organizations traditionally paid the cost by having employees translate between themselves on an ad hoc basis. In critical situations such as air travel, healthcare and finance, it is becoming commonplace that the accounting and communication must be precise and therefore requires the use of common data models to obviate risk.According to Hoberman (2009), ""A data model is a wayfinding tool for both business and IT professionals, which uses a set of symbols and text to precisely explain a subset of real information to improve communication within the organization and thereby lead to a more flexible and stable application environment.""A data model explicitly determines the structure of data. Data models are specified in a data modeling notation, which is often graphical in form.A data model can be sometimes referred to as a data structure, especially in the context of programming languages. Data models are often complemented by function models, especially in the context of enterprise models.
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